Salt Questions · Science, chemistry & environment
Why do things float easier in the Dead Sea?
Short answer
The Dead Sea is about 34% salt, making its water about 1.24 times as dense as fresh water. An object floats when it displaces its own weight of water. Because Dead Sea water is so dense, a swimmer needs to sink only a little way to displace enough water, so people float high on the surface without effort.
How dense is the water?
Archimedes' principle
Water pushes up on a floating object with a force equal to the weight of the water it displaces. The denser the water, the less of the object has to be submerged.
Why people bob like corks
The human body's average density is close to that of fresh water, so in a pool we barely float. In Dead Sea water, about 24% denser, a person floats with much more of the body above the surface, enough to sit up and read a newspaper.
Why it's so salty
The Dead Sea is the lowest lake on Earth, about 430 metres below sea level, with no outlet. The Jordan River brings in water and minerals, and the desert heat evaporates the water, concentrating the salt.
Safety
Don't put your face in the water; it badly stings eyes, and swallowing it is dangerous.
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Cite this page
For school projects and reports. Teachers often prefer the original sources too: see the list below.
The Salt Almanac. (2026, November 8). Why do things float easier in the Dead Sea. https://saltalmanac.com/answers/why-do-things-float-easier-in-the-dead-sea
“Why do things float easier in the Dead Sea.” The Salt Almanac, 8 Nov. 2026, saltalmanac.com/answers/why-do-things-float-easier-in-the-dead-sea. Accessed [today's date].
“Why do things float easier in the Dead Sea.” The Salt Almanac. Last modified November 8, 2026. https://saltalmanac.com/answers/why-do-things-float-easier-in-the-dead-sea.
Original sources
- Wikipedia. Dead Sea. https://en.wikipedia.org/wiki/Dead_Sea
- Wikipedia. Archimedes' principle. https://en.wikipedia.org/wiki/Archimedes'_principle